Weather Alert in Minnesota
Flood Warning issued August 20 at 9:18PM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Chippewa, MN; Lac qui Parle, MN; Yellow Medicine, MN
DESCRIPTION: ...Forecast flooding changed to Minor severity and increased in duration for the following rivers in Minnesota... Cottonwood River at New Ulm affecting Brown County. Cottonwood River Above Springfield affecting Brown County. ...Forecast flooding changed to Minor severity for the following rivers in Minnesota... Minnesota River at Granite Falls HWY 212 affecting Yellow Medicine, Renville and Chippewa Counties. ...The Flood Warning continues for the following rivers in Minnesota... Minnesota River at Morton affecting Renville and Redwood Counties. Minnesota River at Montevideo affecting Yellow Medicine, Lac qui Parle and Chippewa Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Minnesota River at Montevideo. * WHEN...Until further notice. * IMPACTS...At 17.0 feet, Storm sewers may need to be plugged to prevent water from backing up into streets. * ADDITIONAL DETAILS... - At 800 PM CDT Wednesday, the stage was 16.0 feet. - The river is gradually rising. - Forecast...The river is expected to rise to a crest of 16.2 feet Friday afternoon. - Flood stage is 14.0 feet. - Flood History...This crest compares to a previous crest of 16.2 feet on 04/19/1979.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks.
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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